Troubles with color space

I host my pictures on Smugmug, and I know that they convert your pictures to sRGB. I recently uploaded a picture to imageshack.us I thought I change the color space to sRGB but when I uploaded it, it looks like this:

HTTP response: NOT FOUND | MIME changed to 'image/png'

HTTP response: 404 | MIME changed to 'text/html' | Byte size: ZERO

Be sure to set "Convert", not "Assign". Assigning only changes the name of the profile and leaves the image data unchanged, so you want to convert, which changes both.

thanks!